CVE-2026-23351netfilter: nft_set_pipapo: split gc into unlink and reclaim phase
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: split gc into unlink and reclaim phase Yiming Qian reports Use-after-free in the pipapo set type: Under a large number of expired elements, commit-time GC can run for a very long time in a non-preemptible context, triggering soft lockup warnings and RCU stall reports (local denial of service). We must split GC in an unlink and a reclaim phase. We cannot queue elements for freeing until pointers have been swapped. Expired elements are still exposed to both the packet path and userspace dumpers via the live copy of the data structure. call_rcu() does not protect us: dump operations or element lookups starting after call_rcu has fired can still observe the free'd element, unless the commit phase has made enough progress to swap the clone and live pointers before any new reader has picked up the old version. This a similar approach as done recently for the rbtree backend in commit 35f83a75529a ("netfilter: nft_set_rbtree: don't gc elements on insert").
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3c4287f62044a90e73a561aa05fc46e62da173da before 65ca51b9fb85477ab92a04295aed34b38f7c062e; from 3c4287f62044a90e73a561aa05fc46e62da173da before c0f1f85097ac2b6e7d750fe4d05807985cd3fd3a; from 3c4287f62044a90e73a561aa05fc46e62da173da before 16f3595c0441d87dfa005c47d8f95be213afaa9e; from 3c4287f62044a90e73a561aa05fc46e62da173da before 7864c667aed01a58b87ca518a631322cd0ac34c0; from 3c4287f62044a90e73a561aa05fc46e62da173da before c12d570d71920903a1a0468b7d13b085203d0c93; from 3c4287f62044a90e73a561aa05fc46e62da173da before 500a50a301ce962b019ab95053ac70264fec2c21; from 3c4287f62044a90e73a561aa05fc46e62da173da before aff13667708dfa0dce136b8efd81baa9fa6ef261; from 3c4287f62044a90e73a561aa05fc46e62da173da before 9df95785d3d8302f7c066050117b04cd3c2048c2 | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.6.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 5.6; and 7 more ranges | NVD |
References
- https://git.kernel.org/stable/c/65ca51b9fb85477ab92a04295aed34b38f7c062epatch
- https://git.kernel.org/stable/c/c0f1f85097ac2b6e7d750fe4d05807985cd3fd3apatch
- https://git.kernel.org/stable/c/16f3595c0441d87dfa005c47d8f95be213afaa9epatch
- https://git.kernel.org/stable/c/7864c667aed01a58b87ca518a631322cd0ac34c0patch
- https://git.kernel.org/stable/c/c12d570d71920903a1a0468b7d13b085203d0c93patch
- https://git.kernel.org/stable/c/500a50a301ce962b019ab95053ac70264fec2c21patch
- https://git.kernel.org/stable/c/aff13667708dfa0dce136b8efd81baa9fa6ef261patch
- https://git.kernel.org/stable/c/9df95785d3d8302f7c066050117b04cd3c2048c2patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.